Problema con le Java Native Interface

[tulipan]

Ho scritto questa classe:

public class GeoRef {
    public GeoRef() {
    }
    public native void decimals_to_latlon (double decimals, int degrees, int minutes, int seconds);
    
    static { 
    System.loadLibrary("datum_e_proiezioni"); 
    }
    
    public static void main(String[] args){
        int degrees=0; int minutes=0; int seconds=0;
        GeoRef g=new GeoRef();
        
        g.decimals_to_latlon(39.09120555,degrees,minutes,seconds);
        System.out.println("degrees="+degrees+"minutes= "+minutes+"seconds= "+seconds);
    }

}

Ottengo il seguente errore:"java.lang.UnsatisfiedLinkError: no datum_e_proiezioni in java.library.path
"

perchè?

tulipan